若用户的初始账号密码分别是i520520100@itv,123456,当在网管中重置了用户的密码为654321之后,在机顶盒上前后输入的两次用户名和密码依次分别是(),()和(),()
A.i520520100@itv,123456/i520520100@itv,123456 B.i520520100@itv,123456/i520520100@itv,654321 C.i520520100@itv,654321/i520520100@itv,123456 D.i520520100@itv,654321/i520520100@itv,654321